docs: def cli(env, identifier):
      """List virtual server credentials."""
  
      vsi = SoftLayer.VSManager(env.client)
      vs_id = helpers.resolve_id(vsi.resolve_ids, identifier, 'VS')
      instance = vsi.get_instance(vs_id)
  
      table = formatting.Table(['username', 'password'])
      for item in instance['operatingSystem']['passwords']:
          table.add_row([item['username'], item['password']])
      env.fout(table)